feat(Chat): implement chat incident reporting feature

- Added reportChatIncident method in ChatController to handle reporting of chat incidents.
- Introduced a new API route for reporting incidents in chatRouter.
- Implemented chatService methods to ensure the chat report table is created and to handle incident data storage.
- Enhanced frontend components to allow users to report incidents in both multi and random chat dialogs.
- Updated internationalization files to include new strings for reporting functionality in multiple languages.

frontend/src/dialogues/chat/MultiChatDialog.vue

@@ -197,6 +197,9 @@
                 <img @click="action" src="/images/icons/activity.png" class="icon-btn"
                     :class="{ disabled: !selectedTargetUser }" :alt="$t('chat.multichat.action')"
                     :title="selectedTargetUser ? $t('chat.multichat.action_to', { to: selectedTargetUser }) : $t('chat.multichat.action_select_user')" />
+                <button type="button" class="send-btn report-btn" :disabled="!selectedTargetUser" @click="reportSelectedUser">
+                    {{ $t('chat.multichat.report') }}
+                </button>
                 <img @click="roll" src="/images/icons/dice24.png" class="icon-btn" alt="Würfeln" title="Würfeln" />
                 <img @click="openColorPicker" src="/images/icons/colorpicker.png" class="icon-btn"
                     :alt="$t('chat.multichat.colorpicker')" :title="$t('chat.multichat.colorpicker')" />
@@ -236,7 +239,7 @@
 
 <script>
 import DialogWidget from '@/components/DialogWidget.vue';
-import { fetchPublicRooms, fetchRoomCreateOptions, fetchOwnRooms } from '@/api/chatApi.js';
+import { fetchPublicRooms, fetchRoomCreateOptions, fetchOwnRooms, reportChatIncident } from '@/api/chatApi.js';
 import { mapGetters } from 'vuex';
 import { getChatWsUrl, getChatWsCandidates, getChatWsProtocols } from '@/services/chatWs.js';
 import { confirmAction } from '@/utils/feedback.js';
@@ -1305,6 +1308,41 @@ export default {
             this.sendWithToken(payload);
             this.input = '';
         },
+        async reportSelectedUser() {
+            if (!this.selectedTargetUser || !this.messages.length) return;
+            const confirmed = await confirmAction(this, {
+                title: this.$t('chat.multichat.reportConfirmTitle'),
+                message: this.$t('chat.multichat.reportConfirmMessage', { user: this.selectedTargetUser })
+            });
+            if (!confirmed) return;
+
+            const payload = {
+                context: 'multi_chat',
+                reporterHashedId: this.user?.hashedId || null,
+                reporterUsername: this.user?.username || null,
+                offenderUsername: this.selectedTargetUser,
+                incidentAt: new Date().toISOString(),
+                chatHistory: this.messages.map((entry) => ({
+                    type: entry?.type || 'message',
+                    user: entry?.user || '',
+                    text: entry?.action
+                        ? `${entry.action} ${entry.to || ''}`.trim()
+                        : (entry?.text || ''),
+                    timestamp: Date.now(),
+                })),
+                metadata: {
+                    roomId: this.selectedRoom || null,
+                    roomName: this.getSelectedRoomName() || null,
+                    usersInRoom: this.usersInRoom.map((u) => u.name),
+                }
+            };
+            try {
+                await reportChatIncident(payload);
+                this.messages.push({ id: Date.now(), user: 'System', text: this.$t('chat.multichat.reportSent') });
+            } catch (_) {
+                this.messages.push({ id: Date.now(), user: 'System', text: this.$t('chat.multichat.reportError') });
+            }
+        },
         roll() {
             const payload = { type: 'dice', message: '' };
             if (this.debug) console.log('[Chat WS >>]', payload);